CN1289326C - Window pane capable of bonding with tear-away cord - Google Patents

Abstract

A window pane (1), in particular an automobile window pane, is adhesively bonded to a frame (8) of a window opening by an adhesive bead (6), and carries a profiled bead (3) provided with a recess (4) extending longitudinally and a tear-away cord (7) laid therein. Tear-away cord is designed for breaking the adhesive bond between window pane (1) and frame (8). A contact surface is provided for adhesive bead (6) alongside profiled bead (3). In the fitted state, recess (4) is open toward adhesive bead (6) so that the tear-away cord may be pulled without exerting a high force directly in the adhesive bead that abuts the opening of the recess.

Description

Adhesive window panes with rip cords

technical field

The invention relates to a window pane that can be glued and is equipped with a tear-off cord. It has the features of the preamble of claim 1. In general, the term "rip cord" here also refers to silk and suitable analogues which serve the same purpose.

Background technique

From DE-T2-689 11 272 (= EP 0 367 662 B1) we know of a glued and equipped window with pre-assembled rip cords. The rip cord is made of very strong material. It is placed in profiles made of synthetic material, which are glued directly to the surface of said glazing. The window pane is non-detachably attached to the flange of the frame by an adhesive strip, the profiled strip serving as the base for the adhesive strip. By pulling on the tear cord, the profile strip can be separated along its length, which also indirectly cancels the bond between the strip (which is still glued to the frame) and the windowpane. The window pane itself can then be removed from the frame without being damaged.

In this configuration, which has been revisited in this preamble, very special attention has been paid to the limitation of the separation forces that the tearing cord may have to overcome. Premature failure of the thinner tearing cables due to overstressing must be prevented. For this reason, in one embodiment of this prior art, the rip cord is placed in a longitudinal groove of the profile, which groove can be finally filled with synthetic material, if desired, after placing the rip cord . This groove creates a reduction in the cross-section, ie a location for future tear-off, since the groove defines the cross-section to be separated. In other embodiments, the width of the bonding surface of the profile strip on the pane is limited by a special release layer.

We also know of another similar window pane (DE-A1-37 30 345), in which the adhesive strip used to bond the glass to the frame is also attached to the profile strip made of synthetic material , while the profile itself is bonded to the surface of the glass. In the embodiment shown in Figure 6 of this document, the profile may contain grooves for the placement of the rip cords, the grooves being open on one side of the glass surface, that is the side of the glass that is not facing the profile. , and does not point to the surface of the strip. Thus, if a pulling force is applied to the tearing cord, the (deformation) resistance of the wall of the groove between the tearing cord and the strip must be overcome, as well as a non-negligible frictional force, and then, in fact, relative to the groove must be Pull the rip cord across the opening in the hole so that it clears the groove and allows it to pass through the strip.

In such configurations, the main condition for arranging the action of the adhesive on the profile is that the two materials adhere well to each other, which can be based on polyurethane, for example.

In an earlier known form (DE-A1 33 32 232), the tearing cord is placed in a channel closed by a decorative or sealing profile, which runs parallel to the strip along the window pane The edges are stretched, but not bonded to the edges of the glass. In one position, the tear cord is guided inwardly, passing through the adhesive strip, where it forms a handle for applying the necessary separation force.

We also know (DE-A1 34 09 903) that, for example, when extruding the adhesive strip, such tearing cables are directly added to the adhesive strip by means of simultaneous placement, where the adhesive strip then undetachably holds the window pane Attached to the flange of the frame. From the patent DE-PS-673 951 we know the vulcanization of tearing cords in windowpane rubber frames. In this case, the entire cross-section of the adhesive strip or of the sealing frame must be separated, so considerable forces must be applied, and the tearing cord must have a high tensile strength.

Contents of the invention

The object of the present invention is to create, starting from the prior art described at the outset, another embodiment of an adhesive window pane equipped with tear-off cables.

According to the invention, this object is achieved by having the features of claim 1, the features of the dependent claims advantageously giving an improvement of this object.

Since the rip cord is now placed in the groove or groove of the profile, and this groove or groove is oriented open towards the profile (in the assembled state), it is not initially necessary to apply force to make the profile The stronger material of the strip separates or deforms, and this material is used as a spacer in order to obtain, during installation, a strip of defined thickness which is bonded to the surface of the window pane on the side of the profile. Instead, all forces applied act directly on the strip. On the other hand, the more difficult placement of the tear-off cord in the adhesive strip is thus avoided. Instead, a clear separation is obtained between making the profiled strips, placing the rip cords into the preformed longitudinal grooves and applying the adhesive strips. In order to insert the tearing cable into the groove or groove of the profile, a special tool can be used, such as a guide tube equipped with an insertion point which is adapted to the cross-section of the groove. Since the tear cord is still visible on the window pane, which has been pre-fitted but has not been fitted with or covered by the adhesive strip, the correct location of the tear cord installation can be checked by simple visual inspection to confirm. In the event of possible misplacement, the tear cord can even be easily withdrawn and repositioned. A reproducible operation of high quality is thus generally obtained.

In a manner known per se, the tear cord is preferably made of a very strong synthetic material (aramid fiber or similar) with an inherently low stiffness.

In principle, it is immaterial whether the bead is closer to the outer edge of the glass than the profile or vice versa. However, the latter embodiment would be preferred since the rip cord and its handle must be accessible from the inside of the vehicle.

It is not absolutely necessary for the tear cord to pass substantially through the adhesive strip at at least one point, since other means for exerting (separating) forces on the tear cord are also conceivable if necessary. This can be, for example, a partial partial disintegration of the adhesive strip at the points marked by a suitable tool in order to catch the tearing cable later. However it is preferable to pass the rip cord itself or a handle affixed thereto through the strip to allow quick manual actuation of the rip cord.

In an advantageous embodiment, the materials of the profiled strip and the adhesive strip are adapted so that the adhesive does not adhere to the profiled strip. The adhesive is therefore preferably produced on the basis of polyurethane, for example preferably PU with a component that hardens in the humidity of the air. Moisture-curing polymers based on modified silanes (MS polymers) can also be used. The profiles are produced in a manner known per se from thermoplastic elastomer (TPE), which does not form an adhesive bond with the adhesive. As a material group we include, for example, TPE-S (SBS, SEBS), TPE-0, TPE-U, TPE-V and TPE-A under the general term "TPE". The German book "Rmpp Lexikon Chemie", 10th edition, pages 4506 and 4507 give an overview of them. Polypropylene or polyethylene can also be used as material for this profile.

It is also contemplated that the profile bead passes under portions of the bead, thereby limiting the width of the adhesive against the substrate on the glass, that is, in the direction of the outer edge of the window pane. It is thus evident that the rip cord passes directly at the smallest cross-section of the adhesive strip. This result is best obtained because the profiles extend through part of the surface under the rubber strips to receive the grooves for the rip cords. In the loose contact area between adhesive and profiled strip, therefore, a beveled outlet is formed, via which the tearing cable can directly enter the bonding area of the adhesive on the glass surface without great resistance. Obviously, even when the width of this affixed substrate is controlled, adequate retention and sealing of the installed glazing must be ensured.

The grooves for the tear cables can be easily cut to a backdraft so that the tear cables can be installed immediately after the profile is made without falling out.

In a manner known per se, the profiles can be provided laterally with lips and/or slit-covering profiles which extend beyond the edge of the glass, or the profiles can be produced integrally with them. During (automatic) installation of the glazing and when the remaining gap between the glazing edge and the fixing frame is completely covered, such appendages perform the spacer function of the profiles by the action of the centering element.

Obviously, when the parallel profiles and adhesive strips do not cover the entire outer edge of the window pane, the tearing cord need not go around the entire outer edge of the window pane, it only has to extend a distance corresponding to the distance of the profiles and the distance of the adhesive strips superior. This may be the case, for example, with a removable window pane, which can be glued on only one or both sides in a known manner, while the adhesive ensures the articulation or articulation function.

Description of drawings

Further details and advantages of the objects of the present invention can be seen from the drawings of the embodiments and from the description below.

The figures below are schematic and enlarged.

Figure 1 shows a cross-section taken through the edge region of a window pane with profiles glued thereon and grooves made therein; and

Figure 2 shows the same section, but this time the tear cord has been placed in the groove of the profile and the adhesive strip has been applied parallel to the profile.

Detailed ways

In FIG. 1, a window pane 1 made of glass or synthetic material is provided on its surface, along its outer edge, with an opaque edge 2 which, for example, can be fired onto the surface of the glass. On this glass, near the edge of the glass, a profile 3, preferably made of thermoplastic elastomer, is glued. The profile can, for example, be produced by extrusion or casting directly on the glass surface in situ, or it can be glued to the glass as a prefabricated profiling section. According to the invention, on that side wall of the profiled strip 3 which is not facing the edge of the pane, an open groove 4 is formed which runs along the profiled strip. Finally, the profile 3 also includes a portion 5 that is flat or in the shape of a bevel (as shown) that extends over the surface of the glass or over the edge 2 away from the edge of the glass. Its free surface adjoins the opening of the groove 4 . Then, before the glazing is installed, an adhesive strip 6 (this adhesive strip is only shown here as a dotted line) is applied to the contact surface, which is also located on the opaque edge 2, next to and parallel to the profiled strip 3. In order to improve the adhesion between the profiled strip 3 and the adhesive strip 6 on the one hand, and also to improve the adhesion to the window pane on the other hand, the edge 2 can be covered in a known manner with a base layer or a layer of adhesion promoter. In addition, the latter also prevents the adhesive strip from being seen directly and prevents it from deteriorating due to UV radiation.

A subsequent manufacturing and production stage is represented in FIG. 2 . Before laminating the adhesive strip 6, or while laminating, the tearing cord 7 is placed on the length direction of the profiled strip 3 and placed in the groove 4 of the latter. The groove 4 can easily be cut with a backdraft. Although the tearing cable 7 is therefore almost fitted in the same shape, it can be pulled out of it by applying only a small force. Furthermore, as indicated by the dot-dash line, it can be removed laterally from the strip 6 at least in one place in order to provide a means for applying tension (indicated by an arrow), or to be able to be connected to such a means superior. Here, this part is located in the interior space delimited by the window pane. For example, it can be formed by a peripheral strip, which of course must obviously pass through the adhesive twice. In the region of the passage, the tearing cord is actually placed on the contact surface between the adhesive strip 6 and the pane 1 .

In the installed state, the adhesive strip 6 will form a direct snug bond between the window pane 1 and the frame 8 or the flange of the window opening (only a sketch is given). The window glass 1 can thus be glued in the frame of the window opening of the body, practically at the same height as the surface, and the profile 3 (possibly supported by an elastically deformable lip, not shown here, which forms a The lateral outer mounting edges are used as positioning and centering aids.

Outside its surface in contact with the edge 2, the bead also covers the portion 5 of the profile and preferably, this is not absolutely necessary, covers the processing adjacent to the bead 6 recessed in the side wall of the profile 3. Opening of slot 4. By a suitable fit between the materials, it is prevented that the tear cord 7 and the wall of the groove 4, and between the adhesive strip 6 and the tear cord 7 on the one hand, and the adhesive strip 6 and the profile strip on the other hand Any tightness between 3 may also be partially covered by a release agent. Likewise, there is no contact between the adhesive 6 and the portion 5 of the profile 3 , and between the profile 3 and the frame 8 . By superimposing the adhesive strip 6 and the flat or bevel-shaped part 5 of the profile, the width of the adhesive on the glass surface is controlled and defined, so that there is no fear of excessive stress on the tearing cord. The paste width is preferably 6-10mm.

In the installed state, or when the window pane 1 is installed, the strip 6 is plastically deformed towards the profile 3 until the tip of the profile 3 touches the frame 8, whereupon it cooperates with the side wall of the profile and Not glued to it. Its deformed state is shown by dashed line 6'. The groove 4 is completely covered and the adhesive may even partially penetrate it. There is also no tightness between the placed ripping cord 7 and the adhesive strip 6 .

It can be clearly seen from these two figures that the groove 4 is arranged in an obtuse-angled channel between the part 5 and the side wall of the profile 3 which rises away from the glass surface. The separating joint between the side wall and the profile 6 rises against the direction of desired displacement of the tearing cable 7 . When the tearing cord is pulled out of the groove 4 in the direction of the arrow, the tearing cord thus actually encounters a ramp in the separating joint which pulls the part 5 and the strip 6 in the direction of least resistance. Separated, it can slide on this slope or be guided directly on the contact surface between the bead 6 and the pane 1 or its edge 2 . When the pulling is continued, it then separates the adhesive strip 6 over the entire outer edge, allowing in each case to remove the window pane without destroying it. Ideally, only a small amount of residue of the adhesive strip remains glued to the pane 1 or to the edge 2 .

Claims (10)

1. A window glass (1), especially glass used for automobile windows, is used to paste on the frame (8) of the window opening with adhesive strips (6), and it contains and equipped with a profile (3) extending longitudinally (4) in which a tearing cord (7) can be placed to separate the glued joint between the window pane (1) and the frame (8) , the window glass is characterized in that: on its surface located on one side of the strip (3) is provided with a contact surface for the strip (6), the width of the contact surface is limited by the strip (3); In the state, the groove (4) is open towards the contact surface. 2. Glazing according to claim 1, characterized in that the profile (3) comprises a portion (5) glued to the surface of the glass, which is adapted to be covered by the strip (6) and which limits its contact with the The width of the contact surface of the glazing (1), and its surface facing the opposite side of the glazing surface adjoins the opening of the groove (4) accommodating the tearing cord (7). 3. A glazing according to claim 2, characterized in that the portion (5) is arranged to descend from the recess (4) in the form of a ramp or bevel towards the glass surface. 4. Glazing according to any one of the preceding claims 1-3, characterized in that the materials and/or surfaces of the profiles (3), adhesive strips (6) and tearing cords (7) cooperate with each other such that The material or surface does not adhere. 5. Glazing according to any one of the preceding claims 1-3, characterized in that the profiles (3) are made of thermoplastic elastomer (TPE) and the strips (6) are made of polyurethane into. 6. The window pane according to any one of the preceding claims 1-3, characterized in that the tearing cable (7) passes through the adhesive strip (6) at least at one point in order to form or provide a handle. 7. Glazing according to any one of the preceding claims 1-3, characterized in that the tearing cord is completely enclosed between the profile strip and the adhesive strip, and at least in one position, the adhesive strip is equipped with a position Marker, this marker is used to set a handle on the rip line. 8. Glazing according to any one of the preceding claims 1-3, characterized in that the profile (3) is provided with an elastically deformable lip which extends beyond the window pane (1) edge. 9. Glazing according to any one of the preceding claims 1-3, characterized in that the profiles (3) are produced on site by extrusion or cast molding onto the glazing (1). 10. Glazing according to any one of the preceding claims 1-3, characterized in that the profiles (3) are prefabricated and glued to the window pane (1).

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